What is a 2 way butterfly valve?

What is a 2 way butterfly valve?

VF Series M9000 Electrically Actuated, Standard-Pressure, Standard-Temperature Two-Way Butterfly Valves are specifically designed for a wide range of Heating, Ventilating, and Air Conditioning (HVAC) applications, including two-position and modulating control of hot, chilled, or condenser water, and 50/50 glycol …

Why do butterfly valves fail?

The primary failure modes for valves are the valve leaks to environment through flanges, seals on the valve body, valve stem packing not properly protected, over tightened packing nuts, the valve cracks and leaks over the seat.

Do butterfly valves have a flow direction?

The butterfly valves are bi-directional but do have a preferred flow direction. It’s however strongly recommended to install the valves in the preferred flow direction, as it will extend the valve’s life span and will also lower the operating torque.

Do you need gasket for butterfly valves?

Most butterfly valves do not require extra gaskets. All the butterfly valves available on pvcfittingsonline.com for example have built in seals that sit against your flanges and prevent leakage.

Does flow direction matter in butterfly valve?

What is the formula of a valve?

The basic valve sizing equation Q = Cv√∆P can be used to calculate pressure drop, flow rate, or the flow coefficient. For solutions other than water, a correction for a difference in specific gravity of the solution is necessary. This revised formula would be: Q = Cv[√∆P/Sg] with Sg = specific gravity of the liquid.

How do I choose a valve?

The right valve choice means matching the valve’s size to expected flow through the system. Know the chemical compatibility requirements. The valve materials need to be compatible with the gases or liquids flowing through it. Plastic valves usually resist harsh or corrosive chemicals better than metal valves.

How do you choose valves?

Determine the pressure and temperature requirements. Find out both the temperature and pressure ranges where the valve will be installed. Metal valves tend to withstand higher temperatures and pressures than plastic valves. Metal valves are also usually best for pressurized gases.